The default file name for all versions of Microsoft Excel is called "book1"
.xls
A default filename is a name given to a file if you do not choose your own. In Excel the first default filename used is Book1.xls and your file will be called this if you don't specify another one.
Microsoft Excel
A document that is created by Microsoft Excel. Excel is a spreadsheet maker.
Default file format for Excel 2003: .xls Default file format for Excel 2007: .xlsx Note: You can't open lower version file format in upper version. If you want to do this then you will have to download the compatibility pack.
The default file ext for Excel 2010 default install is .xlsx as it was in 2007. 2003 was the last version with a different extension, which was .xls for workbooks.Te default file ext may be changed by going into File-> Options -> Save -> Save in this format.If there is a group policy in place, Excel will inherit the default file extension specified.
MS Excel is a spreadsheet program that creates files called workbooks.
The extension for excel is .xls
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The File name will usually appear at the top of the excel file. It should look something like this: file name - Microsoft Excel...
I have included a link from Microsoft on how to do this.
Similar question has been answered here:What_is_the_file_extension_for_Microsoft_excel_file
You can open a worksheet in excel by following methods:Open the file from File menu.Open the file by double clicking on the file.